add optional useAlbumArtist in MPD.getAlbums
fix albums list covers by calling MPD for albumartists of albums

not used on the full album list
it will not fix that the found albums only show the artist's tracks
remove albumartist setting

so far it is artist only
add "go to album artist" to NowPlaying menu
fix albums list covers by calling MPD for albumartists of albums

not used on the full album list
it will not fix that the found albums only show the artist's tracks
add list merger function to MPD.java
merge albumartist/artist in MPD.getAlbums(Artist artist, boolean trackCountNeeded)
merge albumartist/artist in MPD.getAlbums(Artist artist, boolean trackCountNeeded)
Fix : The queue adapter was rebuilt for each song in the list (wrong curly bracket location)
Robustness : Fix null pointer exception without artist defined in album list.
Quick fix : with the showAlbumArtist option enabled "null" was displayed if both artist names was missing.
Quick fix : with the showAlbumArtist option enabled "null" was displayed if both artist names was missing.
Filter the nowplaying popup menus - No cover art menu on long touch without artist and album - No goto artist menu item without artist - No goto album menu item without album

Allows to avoid null pointer exceptions later if the intent is executed.
faster merge for sorted lists in MPD
Merge branch 'albumartist' of https://github.com/hurzl/dmix into hurzl-albumartist
Minor fix.
fix SongsFragment showing only partial tracklist (artist instead of albumartist)

remove artist member, take artist from given album
show correct cover on complete album list

request artists for all albums if unknown artist
and fix albumartist on them
Merge commit '16bf3481707c147a7589bac97d7757ad3d89034f'

Conflicts:
	JMPDComm/src/org/a0z/mpd/MPD.java